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Author: search.filters.author.Sripumimas, SookmasHas files: No

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    Preharvest blue diode laser irradiation enhances betalain biosynthesis, antioxidant responses, and postharvest quality of red amaranth microgreens during storage
    (2026-12-01)
    Supapvanich, Suriyan
    ;
    Sripumimas, Sookmas
    ;
    Li, Man
    ;
    Kang, Chuankai
    ;
    Puisoongnoen, Nichaphat
    In recent years, light-based technologies have attracted growing interest as a postharvest strategy for maintaining the quality of leafy vegetables and microgreens. This study investigated the effects of blue diode laser irradiation (450 nm, 3 h) on the postharvest quality, antioxidant system, and betalain biosynthesis of red amaranth (Amaranthus tricolor) microgreens during storage at 4 ± 1 °C for 9 d. Blue laser treatment effectively maintained visual quality and reduced weight loss compared with untreated samples. Treated microgreens exhibited significantly lower accumulation of hydrogen peroxide (H₂O₂), superoxide anion (O₂⁻), and lipoxygenase (LOX) activity during storage, indicating reduced oxidative stress and membrane lipid peroxidation. In addition, laser-treated samples maintained higher antioxidant capacity, including ferric reducing antioxidant power (FRAP) and DPPH radical scavenging activity, together with greater retention of total phenolics, flavonoids, vitamin C, and glutathione. Activities of antioxidant-related enzymes, including phenylalanine ammonia-lyase (PAL), superoxide dismutase (SOD), catalase (CAT), and ascorbate peroxidase (APX), were also significantly enhanced by laser irradiation. Furthermore, blue laser treatment effectively delayed chlorophyll degradation and increased betacyanin accumulation during storage. Gene expression analysis revealed significant upregulation of betalain biosynthesis-related genes, including AtrWRKY42–2, AtrCYP76AD1, AtrMYB72, AtrDODA1–1, and AtrB5-GT, particularly during the early storage period. Principal component analysis clearly separated laser-treated and control samples, confirming the positive association between laser irradiation, antioxidant defense, pigment retention, and overall quality maintenance. These findings demonstrate that short-term blue laser irradiation is a promising postharvest technology for enhancing antioxidant defense, regulating betalain biosynthesis, and extending the shelf life of red amaranth microgreens.
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    Pre-peeling salicylic acid and post-slicing melatonin treatment: Effects on browning inhibition and quality improvement in lotus root slices
    (2025-12-01)
    Supapvanich, Suriyan
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    Wongsuwan, Pratumtip
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    Sripumimas, Sookmas
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    Kang, Chuankai
    ;
    Yang, Ting
    Browning is a major problem in lotus root slices. This study examined the combined effects of pre-peeling salicylic acid (SA) and post-slicing melatonin (MT) on browning inhibition and quality retention. Preliminary tests identified optimal conditions as 3 mM SA for 30 min and 0.1 mM MT for 5 min. Intact roots were treated with SA, slices with MT, or both, and stored at 4 °C for 12 days. The combined SA + MT more effectively maintained visual quality by suppressing polyphenol oxidase and peroxidase activities, preserving firmness via reduced polygalacturonase, β-galactosidase, and cellulase activities, and enhancing antioxidant capacity, total phenolics, and flavonoids. It also lowered H<inf>2</inf>O<inf>2</inf> content and lipoxygenase activity, mitigating oxidative stress. Post-slicing MT alone achieved similar browning control but was less effective in texture preservation. These findings indicate that integrated SA and MT application is a promising strategy to extend shelf life and maintain physicochemical quality of fresh-cut lotus root.
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    Efficiency of low dose cyanocobalamin immersion on bioactive compounds contents of ready to eat sprouts (sunflower and daikon) and microgreens (red-amaranth) during storage
    (2020-02-01)
    Supapvanich, Suriyan
    ;
    Sangsuk, Punika
    ;
    Sripumimas, Sookmas
    ;
    Anuchai, Jatuporn
    The objective of this study was to investigate the efficiency of low dose cyanocobalamin (vitamin B<inf>12</inf>) immersion on biologically active compounds improvement of baby vegetables such as sunflower sprouts, daikon sprouts and red-amaranth microgreens during storage. The baby vegetables were dipped in water (control), 0.05 or 0.1 μM cyanocobalamin for 5 min and then stored at 4 ± 1 °C for 9 d. We found that cyanocobalamin immersion, especially at 0.1 μM, could induce antioxidant capacity and certain biologically active compounds such as total phenols and flavonoids concentrations of all baby vegetables when compared to control samples. Cyanocobalmin delayed the loss of ascorbic acid concentration in sunflower sprouts but had no influence on the change in ascorbic acid concentration of daikon sprouts and red-amaranth microgreens during storage. The treatments did not affect the changes in total chlorophylls and carotenoids concentrations of sunflower and daikon sprouts during storage. Interestingly, 0.1 μM cyanocobalamin immersion enhanced betacyanin, betaxanthin and total betalains concentrations of red-amaranth microgreens during storage. These results indicated that low dose cyanocobalamin, vitamin B<inf>12</inf>, is a new potential natural agent improving health beneficiary bioactive compounds in ready to eat baby vegetables during cold storage.